Over time a metal roof without a.
Roof cover over shingles.
When contemplating a new roof many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch.
After all you ll be making a significant and long term investment.
In fact the only pro to a shingle over is it s cheaper and cleaner.
Damaged decking will need to be repaired before you can install any new shingles.
Let s start with the good.
Before you reshingle a roof read our step by step guide for adding new shingles over old ones.
Although it sounds like a good idea we can assure you the cons heavily outweigh the pros.
Step 3 cover the old shingles.
Metal roofs over shingles will also provide an extra layer covering your home helping to further insulate it.
The felt should be secured every six inches with nails or staples.
Install a layer of roofing felt over the roof before you begin installing the new shingles.
Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because.
Both metal and shingle roofs are great options for your next roofing project.
When you should tear off your roof and start from scratch instead.
Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
Damaged shingles should be removed to check the decking for problems.
By placing metal roofing over shingles you can save in the labor costs of ripping them off while also preventing them from being thrown into landfills.
I have a 1949 1600 sf under roof with 8 12 pitches valleys and hips 2 6 rafters on 16 on center sheathed with 3 4 center matched lumber going over at least 1 layer of 3 tab shingles a partial tear took off the old tabs and left a nice wavy surface in pretty good shape.
Why installing new shingles over old shingles can be good.
Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in.
The second benefit is that it acts as a buffer between the metal roof and the shingle roof.
To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below.
Leave the old valley flashing in place and install new over it.
Things to know about metal over shingle roof problems.
If you are trying to decide between the two materials it s important to carefully look at the metal over shingle roof problems.
Disadvantages of metal roofs.
The first is running new underlayment over an existing shingle roof thus covering the old roof.
It s clearly easier and cheaper to leave the old shingles in place but there s some special prep work involved with a re roof removing vents ridge caps and misshapen shingles among other things and you still have to replace or add new flashing which sometimes can be tricky over old roofing.
Advantages of metal roofs over shingles.
